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> For an artificial horizon, there seems no reason to ask for a reflecting
> surface bigger than, say, 3 inches diameter, which should occupy the visual
> field of a sextant at a convenient distance.
True if the body's elevation is high. If low, the lip of the vessel may get
in the way, so fluid would have to be topped off. A larger vessel allows a
greater range of elevations without having the fluid level "too" high. This
might not matter for water, but transporting oils etc...
Bill